參數(shù)資料
型號: XRT83L34
廠商: Exar Corporation
英文描述: QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
中文描述: 四T1/E1/J1收發(fā)左/上海收發(fā)器和時鐘恢復和抖動衰減器
文件頁數(shù): 16/82頁
文件大小: 447K
代理商: XRT83L34
XRT83L34
QUAD T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
PRELIMINARY
REV. P1.3.4
13
CLOCK SYNTHESIZER
S
IGNAL
N
AME
P
IN
#
T
YPE
D
ESCRIPTION
MCLKE1
32
I
E1 Master Clock Input
A 2.048MHz clock for with an accuracy of better than ±50ppm and a duty
cycle of 40% to 60% can be provided at this pin.
In systems that have only one master clock source available (E1 or T1), that
clock should be connected to both MCLKE1 and MCLKT1 inputs for proper
operation.
N
OTES
:
1.
All channels of the XRT83L34 must be operated at the same clock
rate, either T1, E1 or J1.
2.
Internally pulled “Low” with a 50k
resistor.
CLKSEL0
CLKSEL1
CLKSEL2
37
38
39
I
Clock Select inputs for Master Clock Synthesizer - Hardware mode
CLKSEL[2:0] are input signals to a programmable frequency synthesizer that
can be used to generate a master clock from an accurate external clock
source according to the following table.
The MCLKRATE control signal is generated from the state of EQC[4:0]
inputs. See Table 4 for description of Transmit Equalizer Control bits.
Host Mode:
The state of these pins are ignored and the master frequency
PLL is controlled by the corresponding interface bits. See
Table 35
, register
address 1000001.
N
OTE
:
These pins are internally pulled "Low" with a 50k
resistor.
2048
2048
2048
1544
MCLKE1
(kHz)
8
16
16
56
8
56
64
64
128
256
256
128
2048
2048
1544
1544
MCLKT1
(kHz)
1544
X
X
X
1544
X
X
X
X
X
X
X
2048
1544
2048
CLKOUT
(KHz)
1544
2048
1544
2048
1544
2048
1544
2048
1544
2048
1544
2048
1544
0
0
1
1
CLKSEL0
0
1
1
0
0
0
1
1
0
1
1
0
0
0
0
0
CLKSEL1
1
1
1
0
1
0
0
0
1
1
1
1
0
0
0
0
CLKSEL2
0
0
0
1
0
1
1
1
1
1
1
1
0
1
0
0
0
0
1544
2048
X
X
2048
1544
0
1
0
1
MCLKRATE
1
0
1
0
0
1
0
1
1
0
1
0
0
1
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